The Virtue of Valor draws entirely upon the Principle of Courage. It is our personal strength to face adversity and stand firm for our convictions even against personal harm. The Virtue of Valor is what we draw upon to defend the other Virtues.
For example: you are witness to a crime. You know the truth, but are being threatened by those who wish to hide from Justice. Valor is your conviction to Truth and Justice by having the Courage to do what is right even when there is risk to yourself.
Valor means not running away from a challenge because it’s hard. Valor is facing your fears.